For a reaction, ${{\rm{N}}_2}{{\rm{O}}_{5(\;{\rm{g}})}} \to 2{\rm{N}}{{\rm{O}}_{2(\;{\rm{g}})}} + \frac{1}{2}{{\rm{O}}_{2(\;{\rm{g}})}}$ in a constant volume container, no products were present initially. The final pressure of the system when 50% of reaction gets completed is
